Question

Which of the following statements is TRUE?

A. We can sometimes know the exact location and speed of an electron at the same time.

B. All orbitals in a given atom are roughly the same size.

C. Since electrons have mass, we must always consider them to have particle properties and never wavelike properties.

D. Atoms are roughly spherical because when all of the four different shaped orbitals are overlapped, they take on a spherical shape.

E. All of the above are true

Answer 1

A. We can sometimes know the exact location and speed of an electron at the same time. FALSE, this is impoasible accoridng to Heisenberg uncertainty principle, the more exact measurement of location, the least value for speed will be obtained, and vice versa

B. All orbitals in a given atom are roughly the same size.

False, orbitals change with respect to level/size; i.e. 1s vs. 2s orbitals have different shape AND sizes

C. Since electrons have mass, we must always consider them to have particle properties and never wavelike properties.

False, even due to the wave-particle nature of electron/light, we can't do this always

D. Atoms are roughly spherical because when all of the four different shaped orbitals are overlapped, they take on a spherical shape.

False, most of them will not form perfect spheres, acutally they are "deformed" shapes

E. All of the above are true

False, since not all of above are true

NOTE: the most "true" statement is D, since atoms may be modeled as "spherical" due to their nucleus nature, but it fails in the "size overlapped shape"